ITunes kept freezing and now it won't start at all

It all started when I downloaded an iTune U class that contained a lot of videos and chose to download all old episodes. It turned out there so many that it would take 25 hours. I tried to abort the downloads, but apparently that messed something up.
First iTunes started up normally, tried to download "83 items" and then started to freeze up after a minute. I had to shut it down via the Task Manager.
Then it got worse, and now it won't start at all. After I click on the icon to open iTunes (I have Windows 8) the screen turns white, the blue wheel spins and nothing happens. When I hold the cursor over the iTunes icon in the task bar I can see two preview tiles (one for Download and one for iTunes itself), but both are blank (all white) and nothing happens - the blue wheel will spin forever. What do I do?
I do have the latest version of iTunes. If I uninstall and reinstall iTunes, will that solve the problem? And will the content of my library still be there? Thanks!

Hello, J Appleseed.
Thank you for visiting Apple Support Communities.
You can try an uninstall and reinstall of iTunes to see if that resolves the issue. Your iTunes library will not be deleted by doing this. However, this issue could be a result of multiple issues so an uninstall/reinstall may not resolve this. Below, I have included the best articles that will help you isolate and possibly correct this issue. Process each step and test the results after each step processed.
Removing and reinstalling iTunes and other software components for Windows Vista, Windows 7, or Windows 8
http://support.apple.com/kb/ht1923
iTunes for Windows Vista, Windows 7, or Windows 8: Fix unexpected quits or launch issues
http://support.apple.com/kb/ts1717
iTunes: Troubleshooting security software issues
http://support.apple.com/kb/ts3125
Apple software on Windows: May see performance issues and blank iTunes Store
http://support.apple.com/kb/ts4123
Cheers,
Jason H.

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ITunes kept freezing and now it won't start at all

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